diff options
| -rw-r--r-- | changelog.d/12957.misc | 1 | ||||
| -rw-r--r-- | synapse/storage/databases/main/receipts.py | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/changelog.d/12957.misc b/changelog.d/12957.misc new file mode 100644 index 0000000000..0c075276ec --- /dev/null +++ b/changelog.d/12957.misc @@ -0,0 +1 @@ +Use lower isolation level when inserting read receipts to avoid serialization errors. Contributed by Nick @ Beeper. diff --git a/synapse/storage/databases/main/receipts.py b/synapse/storage/databases/main/receipts.py index 21e954ccc1..b6106affa6 100644 --- a/synapse/storage/databases/main/receipts.py +++ b/synapse/storage/databases/main/receipts.py @@ -36,6 +36,7 @@ from synapse.storage.database import ( LoggingTransaction, ) from synapse.storage.engines import PostgresEngine +from synapse.storage.engines._base import IsolationLevel from synapse.storage.util.id_generators import ( AbstractStreamIdTracker, MultiWriterIdGenerator, @@ -764,6 +765,10 @@ class ReceiptsWorkerStore(SQLBaseStore): linearized_event_id, data, stream_id=stream_id, + # Read committed is actually beneficial here because we check for a receipt with + # greater stream order, and checking the very latest data at select time is better + # than the data at transaction start time. + isolation_level=IsolationLevel.READ_COMMITTED, ) # If the receipt was older than the currently persisted one, nothing to do. |